Telephonic unit



Jan 10, 1939. I H, R. WARNKE 3, 7

TELEPHONIC UNIT Filed April 10, 1936' k 4 Sheets-Sheet 1 I I [III HIH JAM AITORNEYS Jan. 10, 1939. H. R. WARNKE 3, 7

TELEPHONIC UNIT Filed April 10, 1936 4 Sheets-Sheet 2 INVENTOR el'dert [2. II ww/fe BY ,M

TA; A424 ATTORNEYS Jan. 10, 1939. H R WARNKE 2,143,097

TELEPHONI C UNIT "Filed April 10, 1936 4 Sheets-Sheet 3 lllllllll lmmumnm INVENTOR M ATTORNEYS H. R. WARNKE TELEPHONIC UNIT Jan. 10, 1939.

Filed April 10, 1936 4 Sheets-Sheet 4 4 I. I. a 0 4 INVENTOR Y 52 22665 2 R Whlilk @444 A ATI'ORNJYS UNITED STATES PATENT OFFICE- TELEPHONIO UNIT Herbert B. Wamke, New York, N. Y., aaaignor to Control Instrument Company, In

N. Y., a corporation of New York Application April 10, 1938, Serial No. 73,695

9 Claim.

This invention relates to a telephonic unit capable of operating as a receiving unit or as a transmitting unit so that a telephone line may be established between a plurality of identical units 6 of the character shown herein by connecting these units in a circuit, and utilizing the same unit at different times for receiving and transmitting.

It is desirable in a device of this kind that theparts shall be compactly and accurately assembled in such manner as to be capable of withstanding rough usage without being incapacitated, and that the operating elements shall be capable of high efliciency operation.

The present device comprises constructions,

including a main frame, which are so arranged as to automatically accurately position the various parts in their assembled relation so that an eillcient, secure, and accurate assembly is accomplished when the parts are fitted together.

A further feature of the present invention is the arrangement of materials in the magnetic circuit which provide high efllciency.

Another feature of the present invention is the provision of adjusting means for accurately p0- sitioning the armature element within the magnetic field.

Other and further objects of the present invention will in part be obvious and will in part be pointed out hereinafter in the specification by reference to the accompanying drawings forming a part of this specification. Like parts are indicated by like characters throughout the several figures of the drawings.

It is to be understood that the disclosure herewith is illustrative and. not to be considered in the limiting sense.

, Fig. 1 is a top plan view of the main frame.

Fig. 2 is a bottom plan view of the main frame.

Fig. 6 is a top plan view of the assembled de vice with the diaphragm omitted.

Fig. '7 is a bottom plan view of the assembled the dithe dim didevice with the diaphragm and clamp rings omitted.

Fig. 8 is an elevational view looking in rection of the arrow D of 6. Fig. 9 is an elevational view looking in rection of the arrow E, Fig. 6.

the dithe di- Fig. 10 is a detail sectional view on line iiiill of Fig. 6 showing the diaphragm in place.

Fig. 11 is a sectional view on line iI-li looking in the direction of the arrow D of Fig. 6.

Fig. 12 is a view of the coil and the permanent magnets and the pole pieces in separated relation illustrating how the parts may be assembled.

Fig. 13 is a plan view of one of the clamp rings used to hold the diaphragm in place. v m

Fig. 14 is an enlarged perspective view of one of the laminated pole pieces.

Fig. 15 is an enlarged perspective view with a portion broken away illustrating a-laminated armature. 1

Fig. 16 is a section through the preferred form of a laminated armature.

Fig. 17 is a detail view illustrating the mounting for the armature.

Fig. 18 is a diagrammatic view illustrating the g0 adjustment feature of the mounting for the armature.

Fig. 19 is a detail view illustrating how the mounting for the armature adjusts the armature in the armature operating opening.

Referring to the drawings and more especially to Figs. 1 to 5 thereof which illustrate-the frame of the device, a main frame I comprises a base I portion 2 having a table 4 which is provided with an opening 5 and which carries integrally there- 30 with'a front plate 6 and a back plate 1. The front plate 6 and the back plate I are connected at the top by integral bars 8 and 9. The front plate 6 is provided with an upper recess Ill for the top pole-piece and with a lower recess ii for 35 the bottom pole piece and with a central opening it for the armature. The back plate I is provided with an upper recess ll for the top pole piece and a lower recess ii for the bottom pole piece. This plate 1 is also provided with a cen- 4o tral opening it for the armature. The upper recesses II and il are matched with their bases in alignment and the lower recesses ii and I! are also matched with their respective bases aligned and the distance between the bars 8 and 9 is exactly the width of the upper recesses so that these several recesses ll, H, il, and is form accurate seats for pole pieces as will be later pointed out. The front plate 6 is provided with a channel ll beneath the central opening I! to accommodate an operating post connecting the armature and the diaphragm. The back plate I is provided with a'V-shaped groove II to receive a 'V-shaped member on the mounting for the armature as willbelater described. This mainframeis one integral die casting and is provided with suitable Another clamp ring 5! of exactly the same con-.

struction is dropped into position over the edge sembly of the device as will be later described. of the diaphragm so that the edge of the dia- Referring now to Figs. 6 to 12 inclusive. the phragm rests between identical clamp rings 55. bottom pole piece I! is positioned inthe main A screw threaded retaining ring 58 is now screw frame so that the shoulders 20 and 2! on this threaded within the internally threaded ring 52 pole piece seat against the upper part of the on the main frame I and this ring .58 tightly lower recess II in the front plate 6 and in the clamps the diaphragm 51 between the pair of screw threaded openings to be utilized in the as- I lower recess I5 in the back plate I. A pair of clamping rings 55. The lugs 56 in engagement upper pole piece and a terminal plate dd of hi clamp bars (Fig. 7) 22 and 24 accurately fit chanwith the recesses 54 in the main frame prevent nels 25 and 28 (Fig. 12) in the bottom pole piece, any rotative action reaching the diaphragm 51 and the clampbars are held in position by mawhen the retaining ring 58 is screwed solidly into chine screws 21 (Fig. '1) which are threaded into p ace- T s m s a ve y s o p s t ve m un the under part ofthe table 4 of the main frame in fo the diaphragm Which is preferably of I. When the bottom-pole piece it is positioned the corrugated type 1 ry light Wei ht met las described, the poles 28 and 29 thereof fit with- The armature S9 is carried by an adjustable in the space between the front plate 5 and the ng 60 (Figs. 6, d This back plate 1 (seeFig. 10) so that this pole piece mounting p i s a relatively heavy m al is now accurately and positively positioned withu-sheped Plate provided W m h p in in the main frame.

The-energizing coil 30 is wound upon a n-,- The armature 59 is mounted between a pair of ably molded magnetically inert spool iii, which plates 64 and 85 (Fig. 10) and is securely locked may be conveniently made of a phenol condensat0 the mounting w h the m h e S r w 6- tion product or other similar material. This The 62 0f the meuhtihS 59 is positioned n spool 3! has the heads thereof provided with a the Groove in the back Plate 7 (F188; 3 d 3) pair of top recesses 32 and a pair of bottom reby machine screws 61 which are positioned in .cesses 3e. These recesses 32 and 34 are exactly the i011! corners of the mounting and are the width of the pole piece is and the length of threadedhhte the belch P e This ethespool is equal to the distance between the meht accurately Positions the armature 59 Within poles 28 and 25 of the pole piece is. the opening 35 of the coil 30 adjacent the back After the pole piece i9 has been assembled to plate t the u e t its front e d yv require adjustment. By loosening the lower. pair of machine screws 37 (Fig. 8) and tightening the upper pair of machine screws 61, the forward end of the armature 59 may be raised or lowered in the opening 35 as desired. If the armature is slightly twisted at the front end thereof, as is sometimes the case, this may be corrected by adjustment of the screws 67. In Figs. 18 and 19, this adjustment is illustrated. By manipulating one of the upper screws 5'8 to tighten the same and the lower opposed screw $1 to loosen the same, the armature 59 will be twisted to dotted line position illustrated in Fig. 18. This action the frame, the coil 30 is slipped into position between the front plate t and theback plate i with the recesses 36 fitting over the pole piece i9. This accurately positions the coil 80 in the assembly with the opening 35 of the coil in the center of the central openings i2 and it of the front and back plates, respectively.

The upper pole piece 36 is slipped into the upper recesses it and it in the front and back plates respectively with the poles ti. and 38 thereof in engagement with the inner sides of the front platesfi and the back plates The bars 8 and 9 of the frame extend along the sides of the upper pole piece 5 securely positioning the is illustrated in Fig. 19 which represents the front pole piece in the assembly Ciamp bars 39 and end of the armature in the opening 35 and shows at fit within channels at and as (Fig. 12) of the w the tightening 01 one new screw and t loosening of its corresponding lower screw will smatmg material is positioned over the clamp tip the front end of the armature, from full line bars 39 and 49 so that machine screws 45 may position to dotted line position in Fig. 19. pass through the terminal plate 41d, and the. In telephonic apparatus minute adjustments d bars 39 and 39 to anchor these several are extremely important so that this construcparts in accurate position. The terminal plate tion which permits maximum adiustability is an of insulafing material carries terminal bars important feature of the present invention.

and 41 to which the terminals 48 and as (Fig. After the botmm Pole Piece 59 and the upper 9) of t 11 39 are S01dere These terminal pole piece 36 have been assembled around the b 45 and 31 are provided with cnnectmg coil 30, the permanent magnets 68 are positioned screws (Fig. 11) 5b and 5t which may be utilaround the These magnets are ized to connect the coil 30 in a suitable circuit. structed as approximately fit amund the From t foregoing it m be observed ma 30 when the ends 69 and E0 of the magnets 68 the parts are so constructed that they are rigidly with the sides the Pole Places and and accurately positioned by a single piece mam 85 respectively, to complete the magnetic circuit.

frame so that when the parts are assembled in The permanent magnets are assembled in Such t main frame, t assembly becomes a rigid manner that like poles of these permanent unitary construction which facilitates great magnets Who-Site sides the accuracy in positioning of the parts. This is spective pieces and 38 so that these pole extremely important in telephonic devices. The Pieces bemme opposite magnetic P 0!! each under part of the main frame I comprises an inside armature to setup a Very stmng magnetic ternally screw threaded ring 52 (Figs. 2 and 10). d through e a m e 9- The pe manent This screw threaded ring is recessed on opposite m ne s 58 re h l in P n y ets H sides with recesses 54' (Fig. 2). Clamp rings 55 and I2 (Figs. 6 and 11) which are attached at are provided with lugs 56 that fit into the retheir bases to the table 5 of the main frame I cesses 54. One of these clamp rings 55 dropped by machine screws ll.

within the screw threaded ring 52 and a dia- In order to obtain the best conditiom for prophragm 51 (Fig. 30) is positioned thereupon. viding a strong working magnetic field for the 6| and also provided with a V-shaped rib 62.

calt currents which are caused by the continuous reversal of the alternating current flux. These two desirable characteristics do not appear in a single metal. However, it has been found that by using laminations of two metals, a compromise is obtained which includes both desirable characteristics. For example 4% silicon steel has a maximum permeability of 3400 units and a maximum resistivity of 51 units, and Swedish iron (substantially pure iron) has a maximum permeability or 10600 units and a maximum resistivity of 9.6 units.

In view of the foregoing, the preferred form of the pole pieces of the present invention comprise a structure made up of laminations (Fig. 14) in which the side pieces I5 and a middle piece 16 are 4% silicon steel and the thin laminated parts ll are Swedish iron (substantially pure iron). These laminations are held together by nickel rivets l8 and 19. It will be observed that the rivet openings through the laminated parts of these pole pieces, and through which the rivets l8 and 19 extend, are positioned differently for each end of the pole piece. For example, the rivets 19 are positioned high in one end of the pole piece and the rivets I8 are positioned low in the opposite end 01 the same pole piece. The reason for this construction is that the openings through which these rivets pass are punched at the time when each laminated sectionof the pole piece is punched from a sheet of metal. The

, position of these rivet holes and the rivets, therewill form both ends of a punching identical in shape, so that if the parts are assembled in hit and miss relation, the result will be a very rough pole piece. This is not desirable. This present construction prevents/some of the laminations being turned end for end relative to other laminations while the pole piece is being assembled. The result is that the edges of all the laminations match preferably and produce a very smooth, even surfaced assembled pole piece.

The same magnetic results that are desirable in the pole pieces are also desirable in the armature, and, therefore, in thepreferred form (Figs. 15 and 6), the armature has a laminated structure in which the outside laminations III are Swedish iron (substantially pure iron) while the inside member ii is preferably silicon steel, ior example, 4% silicon.

In the preferred vform of this armature, the

. various laminations are covered with a cementing material 82 whichpasses between the laminations and also encases the entire armature. One

form of cement suitable for this purpose is a phenol condensation compound which maybe applied to the parts and then heat hardened under pressure so that the parts are accurately and securely held together.

when the unit in the preferred form, as above described, has been assembled, the forward end of the armature 59 is connected with the center of the diaphragm!" by a rigid connecting post 86 (Figs. 9 and 10) so that when the device is used as a transmitter, voice waves cause the diaphragm to vibrate and thereby flex the armature 59, it being understood that the mounting 60 for the armature is rigidly fastened in such manner as not to pivot. The flexing of the armature 55 in the magnetic field sets up a voice current in the coil 30 which is transmitted to a suitable circuit connected with the connecting screws 50 and Si and this circuit is connected with a similar telephonic unit. The voice current enters the voice coil of the corresponding unit and causes the armature to vibrate in accordance with the vibration of the armature of the sending station. This vibration operates the diaphragm at the receiving station, thereby completing the communicating circuit.

All of the parts of the structure heretofore described, with the exception of those parts included in the magnetic circuit, 1. e. the pole pieces,

the permanent magnets, and a diaphragm, are made of some suitable non-magnetic material.

From the foregoing, it will be observed that the present invention provides a very compact, accurately assembled unit capable of high efficiency which is so rigidly constructed as to withstand extremely rough usage without danger of the parts becoming disas'sociated.

I claim:

1. A device of the character described comprising a table having eccentrically disposed openings therein, one of said openings having substantially parallel chord-like edges, a pair of substantially parallel plates extending at right angles to said table, one on each side of the opening having the chord-like edges, spaced cross bars connecting the tops of said plates, said plates having recesses extending downwardly between said bars, and having recesses extending upwardly in alignment with the downwardly extending recesses, pole pieces locked in said recesses, a coil positioned between legs of said pole pieces, and an armature passing through said coil and betweensaid pole pieces.

2. A device of the character described comprising a table having eccentrically disposed openings 'therein, one of said openings having substantially parallel chord-like edges, a pair of substantially parallel plates extending at right angles to said table, one on each side of the opening having the chord-like edges, spaced cross bars connecting the tops of said plates, said plates having recesses extending downwardly between said bars, and having recesses extending upwardly in alignment with the downwardly extending recesses, pole pieces having portions fitting in said recesses and having leg portions lying adjacent said plates, a coil positioned between said leg portions of said pole pieces, and an armature passing through said coil and between the leg portions of said pole pieces.

' 3. A device of the character described comprising a table having eccentrically disposed openings therein, one of said openings having substantially parallel chord-like edges, a pair of substantially parallel plates extending at right angles to said table, one on each side of the opening having the chord-like edges, spaced cross bars connecting the tops of said plates, said plates having recesses extending downwardly between said bars, and having recesses extending upwardly in alignment with the downwardly ex- .tending recesses, pole pieces having portions fit ting in said recesses and having leg portions lying adjacent said plates, a coil mounted on a form, said form having depressions in the opposite edges thereof to receive portions of said pole pieces, whereby the coil is accurately positioned between the leg portions 01' the pole pieces, means for locking said pole pieces relative to said plates, and an armature passing through said coil and between said pole pieces. I

4. A device of the character described comprising a table having eccentrically disposed openings therein, one of said openings having substantially parallel chord-like edges, a. pair of substantially parallel plates extending at right angles to 'said table, one on each side of the opening having the chord-like edges and spaced from said edges, spaced cross bars connecting the tops of said plates, said'plates having-recesses extending downwardly between said bars, and having recesses extending upwardly in alignment with the downwardly extending recesses, pole pieces locked in said recesses, a coil positioned between legs of said pole pieces, an armature passing through said coil and between said pole pieces, and permanent magnets positioned between said plates on the opposite sides of said pole pieces with the ends of said magnets located between said table and said cross bars.

5. A device of the character described comprising a table having eccentrically disposed openings therein, one of said openings having substantially parallel chord-like edges, a pair of substantially parallel plates extending at right angles to said table, one on each side of the opening having the chord-like edges, spaced cross bars connecting the tops of said plates, said plates having recesses extending downwardly between said bars, and having recesses extending upwardly in alignment with the downwardly extending recesses, P le pieces locked in said recesses with their inner extremities in spaced relation, a coil positioned between legs of said pole pieces, said plates having openings therein between said recesses, and an armature having one end fastened to one oi said plates, said armature passing through the openings in said plates and through said coil between the spaced extremities of said pole pieces.

6. Adevice of the character described comprising a table having eccentrically disposed openings therein, one of said openings having substantially parallel chord-like edges, 9. pair of substantially parallel plates extending at right angles to said table, one on each side of the opening having the chord-like edges, spaced cross bars connecting the tops of said plates,

' said plates having recesses extending downwardly between said bars, and having recesses extending upwardly in alignment with the downwardly extending recesses, said plates having openings therein between said recesses, pole pieces locked in said recesses with their inner extremities in spaced relation, a coil positioned between legs of said pole'pieces, an armature passing through said coil, said plates, and between said pole pieces, said armature having one end thereof secured to a bar member, means for adiustably securing said bar member to one of said plates whereby the position of said armature can be varied.

7. A device 01 the character described comprising a table having eccentrically disposed open ings therein, one of said openings having sub:

' stantially parallel chord-like edges, 9. pair of sub-.-

of said pole pieces, an armature passing through said coil, said plates, and between said pole pieces, a substantially U-shaped bar member, means for securing one end of said armature in the opening of said bar member, said bar member having a rib extending across one face thereof, one of said plates having a groove therein to receive said rib, and means for attaching said bar member to said grooved plate, said attaching means being adjustable to vary the position of said armature relative to said coil and. pole pieces.

8. In a telephonic instrument, a pair of oppositely disposed frame members, pole pieces, said frame member and the ends of said pole pieces having cooperating engaging formations for accurately positioning said pole pieces with their faces in spaced relation, a coil, said coil and said pole pieces cooperating to accurately position said coll between said pole pieces, means for locking said pole pieces and said coil relative to said frame members, permanent magnets, said frame members, pole pieces, and coil serving to determine accurately the positions of said permanent magnets, and means for locking said "permanent magnets in assembly.

9. In a device of the character described, the

combination of a plate, pole pieces, a coil, and permanent magnets assembled relative thereto, an armature carrier, an armature secured thereto, and securing means to secure said carrier to said plate with the carrier rockable relative to said plate and with said armature passing through said coil'and between said pole pieces,

said -securing means being adjustable to vary the distance of the armature from either pole piece and to vary the angularity of said arma- 

